@Override
public MediaMetadataCompat getMetadata() {
Object metadataObj = MediaControllerCompatApi21.getMetadata(mControllerObj);
return metadataObj != null ? MediaMetadataCompat.fromMediaMetadata(metadataObj) : null;
}
@Override
public void onMetadataChanged(Object metadataObj) {
Callback.this.onMetadataChanged(MediaMetadataCompat.fromMediaMetadata(metadataObj));
}